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  #1  
Old 02-22-2014, 07:44 PM
06RamPA 06RamPA is offline
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Default new to diesels, looking to upgrade from hemi...

I currently have an 06 2500 hemi, and i'm looking to upgrade to an 06-08 2500 diesel. First question is what are the pros and cons between the 5.9 and 6.7? Also in my price range im looking at one with 100,000 miles or more, so what should i look out for when looking for a used cummins? Any help would be appreciated, or any links to useful info.
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Old 02-22-2014, 08:30 PM
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The main difference between the 5.9 and the 6.7 is the all the emissions equipment that are on the 6.7's. That includes the DPF exhaust system, EGR valve and CCV filter. Because of that a stock 6.7 gets significantly worse fuel mileage than a 5.9 and also requires more maintenance. However they can be deleted to get rid of all that equipment. However that is quite costly and is becoming harder and harder to do because of the EPA.
A big pro to the 6.7 is the variable geometry turbo with the integrated exhaust brake. If you are towing fairly often it is priceless to have. Even for everyday driving it's great! I use mine constantly.

Honestly if you're looking to stay with a 3rd gen I'd recommend looking for a 5.9. Overall it will be cheaper and is a great engine to have. Extremely reliable.
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Old 02-23-2014, 09:53 AM
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Ok thanks that definatly helps out. I'll look for a 5.9. Now if i find one with over 100,000 miles on it, is there anything i should look for or be worried about?
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Old 02-23-2014, 10:42 AM
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Sure. Take it out for a drive. Make sure the transmission still feels like it has life left in it. Drive it hard. Once you get back pull the transmission dip stick and check the fluid. Does it look brown or black? Should look reddish pink.

Next once the engine is warm listen for any loud knocks. While the engine is running pull off the oil cap. Does it have blow by? Is it excessive?

Just a few things...
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Old 05-24-2014, 11:22 PM
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Now another question, what are the pros and cons between the 4, 5, and 6 speed auto transmissions? Im looking at getting a travel trailer, possibly a fifth wheel in the future, other than that, not much towing. Just wanted to know which would be better? Just trying to learn...
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Old 05-25-2014, 08:20 PM
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6 speed is the way to go. Then you can have a lower diff ratio because of the 2 overdrive gears in the transmission which allows you to tow more weight and get the truck moving better.
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Old 05-25-2014, 10:47 PM
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Ok so stay away from the 4speed then? I found its hard to find a six speed. Most i find are four speeds, some five, but thanks that helps though.
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